Cipolla did not face a single break point while breaking Dolgopolov’s serve twice in the first set. The Italian then quickly broke Dolgopolov twice at the start of the second.

Cipolla is scheduled to face Benoit Paire of France, who saved 12 of 14 break points en route to a 6-7 (3/7), 6-3, 6-2 win over Matthias Bachinger of Germany.

Andreev saved eight of nine break points and broke Istomin four times. He is set to play Guillermo Garcia-Lopez of Spain, who comfortably beat Paul-Henri Mathieu of France 6-4, 6-2.

US MEN’S CLAY COURT

AP, HOUSTON, Texas

Third seed Feliciano Lopez of Spain served four aces in the tiebreaker to overpower Italy’s Paolo Lorenzi 6-4, 7-6 (7/4) on Wednesday in the second round of the US Men’s Clay Court Championships.

Lopez, ranked No. 15 in the world, played on clay for the first time this year and fell behind 4-1 in the opening set, before unleashing his big serve to pull out the set. Lopez had three aces to take a 6-1 lead in the tiebreaker and closed it out with an ace on his fourth match point.